Extraction and Antioxidant Activity of Polysaccharides Produced from Liquid Culture of Pleurotus Sajor-Caju PSC-14

( Kian Cho ),( Hayoung Koh ),( Dubok Choi ) 조선대학교 공학기술연구원 2015 공학기술논문지 Vol.8 No.3

This research investigated extraction and antioxidant activity of polysaccharides produced from liquid culture of Pleurotus sajor-caju PSC-14. When the ratio of water to sample was increased from 10:1 to 40:1 (mL/g), the polysaccharides extraction yields were increased from 47.2 to 100%. On the other hand, when the ratio increased from 50:1 to 60:1, the yields of polysaccharides extraction were decreased from 80.2% to 62.3%. Extraction yields of polysaccharides were increased with extraction temperature. Especially, when the extraction temperature was increased from 40 to 80 oC, extraction yields of polysaccharides were increased from 41.2 % to 82.6%. On the other hand, at the extraction temperature of 100 oC, there was a little decrease in polysaccharides yield. Maximum extraction yield of polysaccharides was obtained at the extraction temperature of 90 oC. To investigate effect of polysaccharides concentration on antioxidant activity, DPPH scavenging activities were measured. When the polysaccharides concentration was 15.0 mg/mL, the maximum DPPH radical scavenging activity was obtained, 69.25%.

Fabrication of polyvinylidene difluoride nano-hybrid dialysis membranes using functionalized multiwall carbon nanotube for polyethylene glycol (hydrophilic additive) retention

Kian Hwa Chan,Ee Ting Wong,Muhammad Irfan Khan,Ani Idris,Noordin Mohd Yusof 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

Nano-modification of membrane is another latest technique used to improve the membrane performance. In this paper, the influence and interaction of functionalized multiwall carbon nanotube (FMWCNT) with polyethylene glycol (PEG) as an additive on polyvinylidene difluoride (PVDF) membrane was investigated. The nano-modified membranes were then characterized in terms of pure water permeation (PWP), molecular weight cut-off (MWCO), contact angle, and calculated pore size distributions. Fourier transform infrared spectroscopy (FT-IR) and Scanning Electron Microscope (SEM) were then used to characterize the structure and morphology of the membranes. The separation properties of the membranes with respect to bovine serum albumin (BSA) retention, urea and creatinine clearances were investigated. The results revealed that the interaction of FMWCNT with PEG as an additive has improved the performance of PVDF as a potential dialysis membrane in terms of PWP, hydrophilicity retention, urea and creatinine clearances.

Experimental and Numerical Investigation of Resin Flow Within Different Shapes in the Process of Composite Construction by Using of the Resin Transfer Method

Kian Dadkhah Shokrollahi,Davood Toghraie,Mohammad Hashemian 한국섬유공학회 2020 Fibers and polymers Vol.21 No.3

The main objective of this paper is to analyze the injection cycle in manufacturing of rectangular, rhombus,triangular, trapezoidal parts by using of the resin transfer method. To this end, the resin flow of the injection cycle inrectangular, rhombus, triangular, trapezoidal molds is studied using both experimental method and numerical simulation. Injection cycle is modeled for two composite parts with glass resin epoxy fibers. The injection device is used forexperimental measurements. The available resin in the injection mold and its movement toward forward and permeability inrectangular, rhombus, triangular, trapezoidal molds are measured by using this system. Different tests were conducted forwoven glass fibers. Then, the finite volume method was used to model the flow of resin in four molds. Finally, the injectiontime for glass fiber was determined by experimental and numerical methods, and numerical simulation results were comparedwith experimental measurements. In this research, resin velocity graphs for woven glass fibers are plotted, which show adecrease in the velocity of the resin from the injection site. It was observed in a 90 o layout with a woven vertical glass fiberwith a porosity of 0.6607, the rate of resin advance compared to porosity is 0.623, and also porosity permeability graphs arepresented in a layout for glass fibers. The porosity in the glass fibers in the 9-layer mode was 0.6607, and in the 10-layermode, it was equal to 0.623.

Modification of PES membrane by PEG-coated cobalt doped iron oxide for improved Cu(II) removal

Kian Hwa Chan,Ani Idris,Ee Ting Wong,Noordin Mohd Yusof 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-

Modification of membranes using nanoparticles is another latest trend in membrane technology. In thiswork, the hydrophobic cobalt(II) doped iron oxide nanoparticles were coated with polyethylene glycol ofmolecular weight 600 so as to prevent their agglomeration thus improving their dispersion when addedinto the dope solution containing 20 wt% of polyethersulfone in dimethylformamide. The nanomodifiedmembranes were characterized in terms of flux permeation (Q), wetting ability, contact angle, pore sizeand solute rejection. These membranes were then used to remove Cu(II) and its separation efficiency wasfound to improve significantly

Experimental investigation of effects of sand contamination on strain modulus of railway ballast

Kian, Ali R. Tolou,Zakeri, Jabbar A.,Sadeghi, Javad Techno-Press 2018 Geomechanics & engineering Vol.14 No.6

Ballast layer has an important role in vertical stiffness and stability of railway track. In most of the Middle East countries and some of the Asian ones, significant parts of railway lines pass through desert areas where the track (particularly ballast layer) is contaminated with sands. Despite considerable number of derailments reported in the sand contaminated tracks, there is a lack of sufficient studies on the influences of sand contamination on the ballast vertical stiffness as the main indicator of track stability. Addressing this limitation, the effects of sand contamination on the mechanical behavior of ballast were experimentally investigated. For this purpose, laboratory tests (plate load test) on ballast samples with different levels of sand contamination were carried out. The results obtained were analyzed leading to derive mathematical expressions for the strain modulus ($E_V$) as a function of the ballast level of contamination. The $E_V$ was used as an index for evaluation of the load-deformation characteristics and bearing capacity of track substructure. The critical limit of sand contamination, after which the $E_V$ of the ballast reduces drastically, was obtained. It was shown that the obtained research results improve the current track maintenance approach by providing key guides for the optimization of ballast maintenance planning (the timing of ballast cleaning or renewal).

A Parameter Estimation Approach based on Binary Measurements using Maximum Likelihood Analysis - Application To MEMS

Kian Jafari 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2

This paper presents an attitude towards the parameter estimation problems, based on binary output observations,dedicated to the context of micro-electronic devices such as Micro-Electro-Mechanical Systems (MEMS)self-testing. This approach is based on Maximum Likelihood (ML) estimation of a logistic regression model of aFinite Impulse Response (FIR) system with binary output data. The results of the proposed method are comparedwith an appropriate approach in the micro-electronic field under various scenarios, where it is competitive with thecompared one. This competition becomes bold in the case of a powerful signal-to-noise ratio (SNR) in the system.

Gender, Diversity and Ethnocentrism in Europe

Kian, Azadeh 이화여자대학교 이화인문과학원 2011 탈경계 인문학 Vol.4 No.1

Gendered Islamophobia has become accentuated in the aftermath of the September 11, 2001 tragedy. The way in which the question of the Islamic headscarf was handled by hegemonist feminists in Europe, especially in France, reveals similarities with the colonial narratives of the late Nineteenth century that pointed to the veil as a symbol of inferiority of Islamic culture and as a threat to Western cultural values. The 'headscarf affair' demonstrates that ethnocentrist prejudice continues to encumber Western feminist discourse. Ethnocentrism, which is founded on the primacy of difference and implies domination, reproduces the binary thinking that has marked Orientalism. This paper shows that the bor der line between ethnocentrism and Orientalism as the ideology of colonialism is porous and that the 'othering' process, characteristic of colonial discourse, has resurfaced in Western feminism. Racist and colonialist stereotypical images of Muslim women have thus become commonplace. Like in the colonialist era, Muslim women are depicted as oppressed, eternal victims of patriarchy, characterized by enforced confinement, ignorance, passivity and powerlessness, and in need of rescue by Western feminists. This paper refutes ethnocentric assumptions that essentilaize the differences between us/them, emancipated women/oppressed women, and that have contributed to historical invisibilization and victimization of non-Western women, It criticizes ethnocentric feminist and intellectual paradigms that mark hegemonist currents within Western feminism, and advocates a universality that is not imperialistic.

Experimental Status on Monodisperse Drop Formation in Electrohydrodynamic Atomization

( Kian Sung ),( Chang Sik Lee ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-

This paper was performed to explore the liquid breakup and atomization characteristics for the classification of drop formation mode and background of uniform droplets generation in electrohydrodynamic atomization according to the changing of experimental parameters such as nozzle material (stainless steel, teflon), fluid flow rate, applied electrical field and intensity, and frequency. In results, from the classification map of drop formation modes according to the variation of applied AC voltage and frequency at a stainless nozzle, the droplets size was smaller than the outer diameter of the nozzle tip relatively in the spindle mode. The transition points became clearly to be moved toward the high applied voltage by rising the applied AC frequency beyond 450 ㎐. Also, the droplet radius can be observed quite small in the frequency bandwidth of 350 450 ∼ ㎐. The droplet radiuses decrease as the applied voltage increase for a fixed applied AC frequency within the range from 50 ㎐to 400 ㎐. Over 400 ㎐, the relation between the power intensity and the droplet size was not consistent with a continuous mechanism of liquid breakup. Thus, it is showed that the droplet size distribution using the teflon nozzle was analogous to the results of stainless steel, but the droplet size was bigger than the one of stainless steel relatively in case of a teflon nozzle.

인젝터 특성에 따른 2중 연료의 RCCI 연소에 관한 실험적 연구

성기안(Kian Sung) 한국자동차공학회 2012 한국 자동차공학회논문집 Vol.20 No.2

분산제어(DSI)기법을 적용한 에어백 제어기의 설계 및 운영체제 개발

성기안(kian Sung),김익환(Ik Hwan Kim),이창식(Chang Sik Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

The DSI technology in the side satellite sensors of an airbag ECU which are applied to decide side collisions effectively has been studied recently for common and multiple uses. The side satellite sensor with DSI technology can interface to the two-wire DSI bus using a combination of pulse length encoded voltage levels for transmission of data to remote peripheral units, and can apply to the different vehicles with no software calibration. The DSI is intended as a robust serial interface system suitable for automotive body applications including airbag safety system. <br/> The new airbag ECU was set up with the airbag firing loop ICs with 6 channels (4 frontal channels and 2 side channels) for DC firing and firing loop monitoring, a micromachined capacitive accelerometer with a 2-pole Bessel 400㎐ S/C filter, a multifunctional power supply IC, and the DSI digital and physical ICs. The applied MC9S12DJ256 microcontroller is the next generation of the higher performance and equip with a real time OS and a new crash recognition algorithm. The real time OS is observed the several functions as the internal and external fault diagnostic function, a communication function, and a crash history recording function.<br/> The time-to-fire of the airbag ECU is in qualitative agreement with the requirement time-to-fire of OEM vehicle maker. We have obtained the satisfactory results and wish to future study about an advanced airbag ECU using this technology.